Lactate Dehydrogenase (LDH) Test

What is a lactate dehydrogenase (LDH) test?

This test measures the level of lactate dehydrogenase (LDH), also known as lactic acid, in your blood or sometimes in other body fluids. LDH is a type of protein, known as an enzyme. LDH plays an important role in making your body's energy. It is found in almost all the body's tissues, including those in the blood, heart, kidneys, brain, and lungs.

When these tissues are damaged, they release LDH into the bloodstream or other body fluids. If your LDH blood or fluid levels are high, it may mean certain tissues in your body have been damaged by disease or injury.

Other names: LD test, lactic dehydrogenase, lactic acid dehydrogenase

What is it used for?

An LDH test is most often used to:

Why do I need an LDH test?

You may need this test if other tests and/or your symptoms indicate you have tissue damage or disease. Symptoms will vary depending on the type of tissue damage you have.

You may also need an LDH test if you are currently being treated for cancer.

What happens during an LDH test?

A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.

LDH is sometimes measured in other body fluids, including fluids in the spinal cord, lungs, or abdomen. If you are having one of these tests, your health care provider will give more information about the procedure.

Will I need to do anything to prepare for the test?

You don't need any special preparations for an LDH blood test.

Are there any risks to the test?

There is very little risk to having a blood test. You may have slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly.

What do the results mean?

Higher than normal LDH levels usually means you have some type of tissue damage or disease. Disorders that cause high LDH levels include:

Although the test can show if you have tissue damage or disease, it does not show where the damage is located. If your results showed higher than normal LDH levels, your provider may need to order more tests to make a diagnosis. One of these tests may be an LDH isoenzyme test. An LDH isoenzyme test measures different forms of LDH. It can help your provider find out about the location, type, and severity of tissue damage.

If you have questions about your results, talk to your health care provider.

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